Efoam pump with spring isolated from flow path

ABSTRACT

A foam pump has a spring isolated from a flow path. Due to the arrangement of inner tube and outer tube of the pressing head and a spring installed between the inner tube and the outer tube, in the suction process, the liquid (or emulation) in the bottle flows through the inner channel of the inner tube and thus it does not contact with the outer tube so that the foams will not be polluted by the material spring. The spring is isolated with the foaming flow path so that it does not resist the flow of the foams; the liquid (or emulsion) does not contact the foams so that the foams are not polluted and thus the liquid in a bottle is retained purely; the liquid is not chemically reacted with the material of the spring and thus no harmful object generates.

FIELD OF THE INVENTION

The present invention relates to pumps, in particular to a foam pumpwith a spring isolated from a flow path. The foam pumps of the presentinvention are suitable for the packing bottles of cosmetics, drugsundries, medical things, everyday used articles, etc.

BACKGROUND OF THE INVENTION

Foam pumps are frequently used in the packing bottles of cosmetics, drugsundries, medical things, everyday used articles, etc. All the foamingpumps are installed with springs at inner sides thereof. The liquid oremulsions within the bottles passes through the springs and compressedby the pumps and then are sprayed out. However the springs will provideresist forces to the packing objects so that the liquid or emulsion cannot flow out frequently. Moreover, the springs will pollute the packingobjects so that the packing objects will react with the material of thesprings so as to generate harmful objects to human bodies. Thus thisprior way is not matched to the requirement of environmental protection,and is harmful to human bodies.

Thus there is an eager demand for a novel way to improve the abovementioned defects in the prior art. In this improvement structure, thespring is isolated with the liquid and the emulsion.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a foam pump with aspring isolated from a flow path, wherein the spring is isolated withthe foaming flow path so that it does not resist the flow of the foams;the packed object is not in contact with the foams so that the foams arenot polluted and thus the packed objects (liquid or foams) therein isretained purely; the packed object is not chemically reacted with thematerial of the spring and thus no harmful object generates; theoperation of the present invention is convenient and easy with a steadyflow and reliable output.

To achieve above object, the present invention provides A foam pump witha spring isolated from a flow path, comprising:

a pressing head (100) at an upper side thereof, an inner tube extendingdownwards from the pressing tube, and an outer tube enclosing the innertube; a lower part of the inner tube being higher than a lower openingof the outer tube; an inner side of the pressing tube being a hollowchannel for outputting foams; the hollow channel of the pressing tubebeing communicated to the inner tube;

a net tube (300) installed within the inner tube of the pressing headand communicated to the inner tube of the pressing tube; the net tube300 having a net-like structure;

a pump upper casing (350) extended from a lower side of the outer tubeof the pressing head; the pump upper casing having a dome outer shapewith an upper opening for passing the pressing head; a gap being formedbetween the outer tube of the pressing head and the opening of the pumpupper casing so that outer air can pass through the gap to flow into aninterior of the pump; an upper inner side of the pump upper casing beingan inner upper cylinder and a lower inner part of the pump upper casingbeing a lower cylinder (352); a lower inner wall of the lower cylinderof the pump upper casing being formed with threads (9); the threadsserving to screw to outer threads of a bottle; a space between the innertube and outer tube of the pressing head being communicated to an innerspace of the pump upper casing (350) at a position above threads; inoperation, the pump upper casing being slidable along an inner spacebetween the inner tube and outer tube of the pressing head;

an upper piston (400) having a multi-stage structure and an upper stagethereof has a smaller diameter than a lower one; the upper piston beingopened at an upper side and lower side thereof; the uppermost stage(401) of the upper piston being protruded into a space between the innertube (102) of the pressing head and the net tube (300) so that the innerspace of the upper piston (400) being communicated to the inner channelof the net tube (300) and the inner channel of the inner tube (102); aplurality of through holes (405) being formed in an annular transversalring (404) of the upper piston (400);

an air valve (500) having a reduced size which is reduced from an upperside to a lower side thereof; the air valve having a hollow center whichis opened at an upper side thereof; the air valve being communicated tothe inner space of the net tube (300); a lowest part of the air valve(500) having a sealed bottom; by a large suction force, the liquid canflow through the periphery of the air valve in force to flow upwards tobe sprayed out from a mouth (104) of the pressing head (100);

a lower piston (120) having a cylindrical structure with a hollowcenter; an upper hollow center of the lower piston receiving the airvalve (500) so that an upper side of the air valve being tightly engagedto an inner wall of the lower piston (120); an outer middle part of thelower piston (120) being protruded with a flange (121); a plurality ofslots (122) being formed in the flange; a lower side of the lower pistonbeing biforked into an inner ring (123) and an outer ring (124);

an elastic sheet (600) being a round cylinder and being tightly engagedinto a recess (402) in an inner wall of the upper piston (400); a lowerside of the elastic sheet resisting against an upper wall of the flange(121) of the lower piston (120); a lower outer wall of the elastic sheetbeing extended with an elastic outer annular sheet (601) which shieldsthe plurality of through holes (402) in an annular transversal ring(403) of the upper piston from a lower side of the annular transversalring; a lower inner wall of the elastic sheet (600) being extended withan elastic inner annular sheet (602) which shields the plurality ofslots (122) in the flange (121) from the upper side of the flange;

a lower post (700) having a cylindrical structure with a hollow centerand a sealed lower bottom; a lower side of the lower post being formedwith a tapered head (701); a tip of the tapered head facing downwards;an upper side of the lower post being tightly engaged with the innerring (123) of the lower piston (120);

a lower casing (130) being formed by an inner pipe (131) and an outerpipe (132); the inner pipe (131) and the outer pipe (132) beingconnected at a lower bottom of the outer pipe (132); the outer pipe(132) having a round cylindrical structure and being opened at an upperside thereof and having a seal bottom (135) enclosing the inner tube(131); an upper end of the lower casing (130) expanding transversally tobe engaged into an annular slot (355) in an inner wall of the uppercasing (350) above the thread (9); the inner pipe being a round cylinderand being opened at an upper side thereof; an outer ring (123) of thelower piston (120) being tightly engaged to an inner wall of the innerpipe (131) of the lower casing; a reduced pipe (133) being extended froma lower end of the lower pipe and having a reduced diameter smaller thanthat of the lower pipe; an upper side of the reduced pipe (133) beingprotruded into an inner space of the lower pipe (131) and being extendedas a shoulder portion (134) which resists against an upper surface ofthe tapered head (701) of the lower post (700); an outer wall of thelowest stage (403) of the upper piston (400) movably resisting againstan inner wall of the outer pipe of the lower casing; and

a suction tube (15) having an upper end inserted into an inner space ofthe reduced pipe (133) to resist against an inner wall of the reducedpipe (133) of the lower casing (130); and

a spring (200) winding around the lower piston at a portion below theflange (121) thereof and the inner tube (131) at a portion within theouter tube (132) of the outer casing (130); the spring being acompressible and resilient spring; and a lower end of the springresisting against the bottom (135) of the lower casing.

The various objects and advantages of the present invention will be morereadily understood from the following detailed description when read inconjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of the foam pump of the presentinvention.

FIG. 1-1 is a perspective view about the detailed structure of theelastic sheet of the present invention.

FIG. 2 shows an assembled outlook of the present invention.

FIG. 3 is a cross sectional schematic view of the foaming pump of thepresent invention, wherein the pump is in a static state.

FIG. 4 is a cross sectional schematic view of the foaming pump of thepresent invention, wherein the pump is in a pressing state and the flowpath is also indicated.

FIG. 5 is a cross sectional schematic view of the foaming pump of thepresent invention, wherein the different cavities for filling liquid ofthe present invention is illustrated.

DETAILED DESCRIPTION OF THE INVENTION

In order that those skilled in the art can further understand thepresent invention, a description will be provided in the following indetails. However, these descriptions and the appended drawings are onlyused to cause those skilled in the art to understand the objects,features, and characteristics of the present invention, but not to beused to confine the scope and spirit of the present invention defined inthe appended claims. In the following, the foam pump of the presentinvention is illustrated with reference to FIGS. 1, 2 and 3.

A pressing head 100 has a pressing tube 101 at an upper side thereof, aninner tube 102 extending downwards from the pressing tube 101, and anouter tube 103 enclosing the inner tube 102. A lower part of the innertube 102 is higher than a lower opening of the outer tube 103. An innerside of the pressing tube 101 is a hollow channel for outputting foams.The hollow channel of the pressing tube 101 is communicated to the innertube 102 thereof.

A net tube 300 is installed within the inner tube 102 of the pressinghead 100 and is communicated to the inner tube 102 of the pressing tube1. The net tube 300 has a net-like structure.

A pump upper casing 350 is extended from a lower side of the outer tube103 of the pressing head 100. The pump upper casing 359 has a dome outershape with an upper opening for passing the pressing head 100. A gap isformed between the outer tube 103 of the pressing head and the openingof the pump upper casing 350 so that outer air can pass through the gapto flow into an interior of the pump. An upper inner side of the pumpupper casing 350 is an inner upper cylinder 351 and a lower inner partof the pump upper casing 350 is a lower cylinder 352. A lower inner wallof the lower cylinder 352 of the pump upper casing 350 is formed withthreads 9. The threads 9 serve to screw to outer threads of a bottle(not shown) with packed objects (such as liquid or emulsion). A spacebetween the inner tube 102 and outer tube 103 of the pressing head 100is communicated to an inner space of the pump upper casing 350 at aposition above threads 9. In operation, the pump upper casing isslidable along an inner space between the inner tube 102 and outer tube103 of the pressing head 100.

An upper piston 400 has a multi-stage structure and an upper stagethereof has a smaller diameter than a lower one; the upper piston 400 isopened at an upper side and lower side thereof. The uppermost stage 401of the upper piston 400 is protruded into a space between the inner tube102 of the pressing head 100 and the net tube 300 so that the innerspace of the upper piston 400 is communicated to the inner channel ofthe net tube 300 and the inner channel of the inner tube 102. Aplurality of through holes 405 are formed in an annular transversal ring404 of the upper piston 400.

An air valve 500 has a reduced size which is reduced from an upper sideto a lower side thereof. The air valve 500 has a hollow center which isopened at an upper side thereof. The air valve 500 is communicated tothe inner space of the net tube 300. A lowest part of the air valve 500has a sealed bottom. By a large suction force, the liquid can flowthrough the periphery of the air valve in force to flow upwards to besprayed out from a mouth 104 of the pressing head 100.

A lower piston 120 has a cylindrical structure with a hollow center. Anupper hollow center of the lower piston 120 receives the air valve 500so that an upper side of the air valve 500 is tightly engaged to aninner wall of the lower piston 120. An outer middle part of the lowerpiston 120 is protruded with a flange 121. A plurality of slots 122 areformed in the flange 121. A lower side of the lower piston 120 isbiforked into an inner ring 123 and an outer ring 124.

An elastic sheet 600 is a round cylinder and is tightly engaged into arecess 402 in an inner wall of the upper piston 400. A lower side of theelastic sheet 600 resists against an upper wall of the flange 121 of thelower piston 120. Referring to FIG. 1-1, a lower outer wall of theelastic sheet 600 is extended with an elastic outer annular sheet 601which shields the plurality of through holes 402 in an annulartransversal ring 403 of the upper piston 400 from a lower side of theannular transversal ring 403. A lower inner wall of the elastic sheet600 is extended with an elastic inner annular sheet 602 which shieldsthe plurality of slots 122 in the flange 121 from the upper side of theflange 121.

A lower post 700 has a cylindrical structure with a hollow center and asealed lower bottom. A lower side of the lower post 700 is formed with atapered head 701. A tip of the tapered head 701 faces downwards. Anupper side of the lower post 700 is tightly engaged with the inner ring123 of the lower piston 120.

A lower casing 130 is formed by an inner pipe 131 and an outer pipe 132.The inner pipe 131 and the outer pipe 132 are connected at a lowerbottom of the outer pipe 132. The outer pipe 132 has a round cylindricalstructure and is opened at an upper side thereof and has a seal bottom135 enclosing the inner tube 131. An upper end of the lower casing 130expands transversally to be engaged into an annular slot 355 in an innerwall of the upper casing 350 above the thread 9. The inner pipe 131 is around cylinder and is opened at an upper side thereof. An outer ring 123of the lower piston 120 is tightly engaged to an inner wall of the innerpipe 131 of the lower casing 130. A reduced pipe 133 is extended from alower end of the lower pipe 131 and has a reduced diameter smaller thanthat of the lower pipe 131. An upper side of the reduced pipe 133 isprotruded into an inner space of the lower pipe 131 and is extended as ashoulder portion 134 which resists against an upper surface of thetapered head 701 of the lower post 700. As illustrated in FIG. 1, anouter wall of the lowest stage 403 of the upper piston 400 movablyresists against an inner wall of the outer pipe 131 of the lower casing130.

A suction tube 15 has an upper end inserted into an inner space of thereduced pipe 133 to resist against an inner wall of the reduced pipe 133of the lower casing 130.

A washer 8 encloses an uppermost outer wall of the outer pipe 131 of thelower casing 130 and resists against an inner wall of the lower cylinder352 of the pump upper casing 350.

A spring 200 winds around the lower piston 120 at a portion below theflange 121 thereof and the inner tube 131 at a portion within the outertube 132 of the outer casing 130. The spring 200 is a compressible andresilient spring. A lower end of the spring 200 resists against thebottom 135 of the lower casing 130.

Referring to FIG. 1, in the present invention, a further dustproof cover800 serves to cover upon the pressing head 100 and the pump upper casing350 so as to prevent dust to flow into the pump of the presentinvention.

The operation of the present invention will be described herein withreference to FIGS. 3 and 4. In FIG. 4, a path A shows the flow path ofthe liquid (or emulsion), a path B shows the flow path of the air and apath G shows the flow of the foams which are mixtures of air and liquid(or emulsion).

When the pressing head 100 is pressed as illustrated in FIGS. 3 and 4,the lowest stage 403 of the upper piston 400 will move downwards alongthe inner wall of the outer pipe 132 of the lower casing; and the spring200 will be compressed until the a lower side of the annular transversalring 403 of the upper piston 400 resists against the bottom 135 of theouter casing 130. At this moment, emulsion original in the space I (seeFIG. 3) will flow into the space F (see FIG. 5); and air will enter intothe space C (see FIG. 5) from the outer side of the foam pump of thepresent invention and the air originally in the space D (see FIG. 5)will be compressed so as to pass through the slits 122 on the flange 121of the lower piston 120 and then to eject the inner annular sheet 602 tomove upwards and thus the liquid (or emulsion) passes through the slits122 into the a space between the upper piston 400 and the lower piston120 and then further enters into the inner space of the net tube 300.The liquid (or the emulsion) in the bottle (not shown) originally filledin the space F (see FIG. 5) will flow through the space between thelower post 700 and the inner ring 124 of the lower piston 120 and thenenter into the interior of the net tube 300 along the path B indicatedin FIG. 5 as the tapered head 701 of the lower post 700 moves downwards.However the amount of the liquid flows into the space F each time isvery little and thus a few times are necessary for pumping liquid intothe space F. When the liquid in space F is sufficient, a compressingaction of the pressing head 100 cause the liquid in the space F to becompressed to be sucked upwards along the path B shown in FIG. 3. Thenthe liquid (or emulsion) enters into the inner space of the net tube 300to be mixed with the air. Since the pressure to mix air and liquid (oremulsion) is very strong and thus the air and liquid (or emulsion) aremixed sufficiently to form as foams which is sucked out from thespraying mouth 104 of the pressing head 100 along the flow line G asillustrated in FIG. 4.

Furthermore, when the pressing head 100 moves upwards, the spring 200 isdecompressed until the upper piston 400 resists against an inner wall atthe upper inner side of the upper casing 350. The air in the space Cwill flow through the plurality of through holes 405 in an annulartransversal ring 404 of the upper piston 400 and then pull away theelastic outer annular sheet 601 of the elastic sheet 600 to enter intothe space D. The shoulder portion 134 tightly resists against the uppersurface of the tapered head 701 of the lower post 700 so as to isolatethe liquid (or emulsion) flow between the bottle (not shown) and theinner pipe 131 of the flow casing 130.

The foams from the pump are slender and uniform without any liquid so asto have a preferred effect. In above mentioned process with reference toFIGS. 2 and 3, due to the inner tube and outer tube of the pressing head100 and the spring 200 winds around the lower piston 120 at a portionbelow the flange 121 thereof and the inner tube 131 at a portion withinthe outer tube 132 of the outer casing 130, thus, in the suctionprocess, the liquid (or emulation) flows through the inner channel ofthe inner tube and thus it does not contact with the spring so that thefoams will not be polluted by the spring.

The preferred effects of the present invention is that the spring isisolated with the foaming flow path so that it is not in the flow of thefoams so that the foams are not polluted and thus the packed objects(liquid or foams) therein is retained purely; the liquid (or emulsion)is not chemically reacted with the material of the spring and thus noharmful object generates; the operation of the present invention isconvenient and easy with a steady flow and reliable output.

It should be noted that the foam pumps of the present invention aresuitable for the packing bottles of cosmetics, drug sundries, medicalthings, everyday used articles, etc.

The present invention is thus described, it will be obvious that thesame may be varied in many ways. Such variations are not to be regardedas a departure from the spirit and scope of the present invention, andall such modifications as would be obvious to one skilled in the art areintended to be included within the scope of the following claims.

1. A foam pump with a spring isolated from a flow path, comprising: apressing head (100) at an upper side thereof, an inner tube extendingdownwards from the pressing tube, and an outer tube enclosing the innertube; a lower part of the inner tube being higher than a lower openingof the outer tube; an inner side of the pressing tube being a hollowchannel for outputting foams; the hollow channel of the pressing tubebeing communicated to the inner tube; a net tube (300) installed withinthe inner tube of the pressing head and communicated to the inner tubeof the pressing tube; the net tube 300 having a net-like structure; apump upper casing (350) extended from a lower side of the outer tube ofthe pressing head; the pump upper casing having a dome outer shape withan upper opening for passing the pressing head; a gap being formedbetween the outer tube of the pressing head and the opening of the pumpupper casing so that outer air can pass through the gap to flow into aninterior of the pump; an upper inner side of the pump upper casing beingan inner upper cylinder and a lower inner part of the pump upper casingbeing a lower cylinder (352); a lower inner wall of the lower cylinderof the pump upper casing being formed with threads (9); the threadsserving to screw to outer threads of a bottle; a space between the innertube and outer tube of the pressing head being communicated to an innerspace of the pump upper casing (350) at a position above threads; inoperation, the pump upper casing being slidable along an inner spacebetween the inner tube and outer tube of the pressing head; an upperpiston (400) having a multi-stage structure and an upper stage thereofhas a smaller diameter than a lower one; the upper piston being openedat an upper side and lower side thereof; the uppermost stage (401) ofthe upper piston being protruded into a space between the inner tube(102) of the pressing head and the net tube (300) so that the innerspace of the upper piston (400) being communicated to the inner channelof the net tube (300) and the inner channel of the inner tube (102); aplurality of through holes (405) being formed in an annular transversalring (404) of the upper piston (400); an air valve (500) having areduced size which is reduced from an upper side to a lower sidethereof; the air valve having a hollow center which is opened at anupper side thereof; the air valve being communicated to the inner spaceof the net tube (300); a lowest part of the air valve (500) having asealed bottom; by a large suction force, the liquid can flow through theperiphery of the air valve in force to flow upwards to be sprayed outfrom a mouth (104) of the pressing head (100); a lower piston (120)having a cylindrical structure with a hollow center; an upper hollowcenter of the lower piston receiving the air valve (500) so that anupper side of the air valve being tightly engaged to an inner wall ofthe lower piston (120); an outer middle part of the lower piston (120)being protruded with a flange (121); a plurality of slots (122) beingformed in the flange; a lower side of the lower piston being biforkedinto an inner ring (123) and an outer ring (124); an elastic sheet (600)being a round cylinder and being tightly engaged into a recess (402) inan inner wall of the upper piston (400); a lower side of the elasticsheet resisting against an upper wall of the flange (121) of the lowerpiston (120); a lower outer wall of the elastic sheet being extendedwith an elastic outer annular sheet (601) which shields the plurality ofthrough holes (402) in an annular transversal ring (403) of the upperpiston from a lower side of the annular transversal ring; a lower innerwall of the elastic sheet (600) being extended with an elastic innerannular sheet (602) which shields the plurality of slots (122) in theflange (121) from the upper side of the flange; a lower post (700)having a cylindrical structure with a hollow center and a sealed lowerbottom; a lower side of the lower post being formed with a tapered head(701); a tip of the tapered head facing downwards; an upper side of thelower post being tightly engaged with the inner ring (123) of the lowerpiston (120); a lower casing (130) being formed by an inner pipe (131)and an outer pipe (132); the inner pipe (131) and the outer pipe (132)being connected at a lower bottom of the outer pipe (132); the outerpipe (132) having a round cylindrical structure and being opened at anupper side thereof and having a seal bottom (135) enclosing the innertube (131); an upper end of the lower casing (130) expandingtransversally to be engaged into an annular slot (355) in an inner wallof the upper casing (350) above the thread (9); the inner pipe being around cylinder and being opened at an upper side thereof; an outer ring(123) of the lower piston (120) being tightly engaged to an inner wallof the inner pipe (131) of the lower casing; a reduced pipe (133) beingextended from a lower end of the lower pipe and having a reduceddiameter smaller than that of the lower pipe; an upper side of thereduced pipe (133) being protruded into an inner space of the lower pipe(131) and being extended as a shoulder portion (134) which resistsagainst an upper surface of the tapered head (701) of the lower post(700); an outer wall of the lowest stage (403) of the upper piston (400)movably resisting against an inner wall of the outer pipe of the lowercasing; and a suction tube (15) having an upper end inserted into aninner space of the reduced pipe (133) to resist against an inner wall ofthe reduced pipe (133) of the lower casing (130); and a spring (200)winding around the lower piston at a portion below the flange (121)thereof and the inner tube (131) at a portion within the outer tube(132) of the outer casing (130); the spring being a compressible andresilient spring; and a lower end of the spring resisting against thebottom (135) of the lower casing.
 2. The foam pump with a springisolated from a flow path as claimed in claim 1, wherein a washerencloses an uppermost outer wall of the outer pipe of the lower casingand resists against an inner wall of the lower cylinder of the pumpupper casing.
 3. The foam pump with a spring isolated from a flow pathas claimed in claim 1, wherein the upper piston is formed as a severalstage structures; each stage of the elastic sheet is a round cylinderand is connected to other stage by a transversal sheets; each lowerstage of the elastic sheet has a diameter larger than that of the upperstage.
 4. The foam pump with a spring isolated from a flow path asclaimed in claim 1, wherein the foam pump is suitable for the packingbottles of cosmetics, drug sundries, medical things, and everyday usedarticles.
 5. The foam pump with a spring isolated from a flow path asclaimed in claim 1, wherein the pressing head has a round pressing tube.6. The foam pump with a spring isolated from a flow path as claimed inclaim 1, further comprising dustproof cover (800) serves to cover uponthe pressing head 100 and the pump upper casing (350) so as to preventdust to flow into the pump of the present invention.